I just built a workstation with a 32 core Threadripper Pro, 128 GB ECC RAM, Thunderbolt 4, and an RTX 4090 for $6,500.
Two data points from Apple:
a) M2 Ultra 24 cores, 128GB ram, 2TB storage = $5,200
b) M2 ultra 24 cores, 192GB ram, 4GB storage = $6,600
Likely 1/4th the size, 1/4th the power consumption, and 4x the ram bandwidth. Have you by chance played with any LLMs? Just saw a post that someone managed 5 tokens/sec with the llama 65B model.